Patents by Inventor Violete L. Stevens
Violete L. Stevens has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4347194Abstract: Polyhydroxyl polyether compounds containing at least one monomeric unit each of the formulae: ##STR1## are disclosed. Polymeric condensation resins are prepared by allowing the polyhydroxyl polyethers to react with polyfunctional chain-forming compounds containing functional groups reactive with the hydroxyl groups of polyhydroxyl polyethers. The polyhydroxyl polyether compounds enhance the flame-retardant properties of polymeric condensation resins such as polyurethanes.Type: GrantFiled: May 11, 1981Date of Patent: August 31, 1982Assignee: The Dow Chemical Co.Inventors: Sally P. Ginter, Chester E. Pawloski, Violete L. Stevens
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Patent number: 4298709Abstract: Polyhydroxyl polyether compounds containing at least one monomeric unit each of the formulae: ##STR1## are disclosed. Polymeric condensation resins are prepared by allowing the polyhydroxyl polyethers to react with polyfunctional chain-forming compounds containing functional groups reactive with the hydroxyl groups of polyhydroxyl polyethers. The polyhydroxyl polyether compounds enhance the flame-retardant properties of polymeric condensation resins such as polyurethanes.Type: GrantFiled: June 25, 1980Date of Patent: November 3, 1981Assignee: The Dow Chemical CompanyInventors: Sally P. Ginter, Chester E. Pawloski, Violete L. Stevens
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Patent number: 4296220Abstract: A method for preparing vinyl ester resins comprises reacting mono-, di- or polyhydroxy functional phenols with a tertiary alkyl glycidyl ether in the presence of a catalyst, e.g., triphenyl phosphine, followed by dealkylating and esterifying the adduct with an olefinically unsaturated aliphatic acid, e.g., acrylic acid, in the presence of a strong acidic catalyst, e.g., p-toluene sulfonic acid.Type: GrantFiled: June 2, 1980Date of Patent: October 20, 1981Assignee: The Dow Chemical CompanyInventors: Harold O. Seeburger, Ralph G. Beattie, Violete L. Stevens
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Patent number: 4296227Abstract: Polyether resins of the formula XA.sub.m wherein A is of the formula ##STR1## and X, R, R' and R" are specified substituents are disclosed.Type: GrantFiled: January 31, 1980Date of Patent: October 20, 1981Assignee: The Dow Chemical CompanyInventors: Harold O. Seeburger, George J. Atchison, Violete L. Stevens
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Patent number: 4269727Abstract: Effective radiation curable flame retardant compositions include compounds of the formula: ##STR1## wherein A is hydrogen or methyl; A' is hydrogen, methyl, phenyl or halogen; n is 1 or 1.5 and when n is 1, B is hydrogen or methyl and when n is 1.5, B is hydrogen; Y is oxygen or sulfur; R and R' are hydrogen, methyl, chloromethyl or bromomethyl.Type: GrantFiled: October 5, 1979Date of Patent: May 26, 1981Assignee: The Dow Chemical CompanyInventors: George J. Atchison, Gerald K. McEwen, Violete L. Stevens
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Patent number: 4228108Abstract: Effective reactive flame retardants are novel compounds of the formula: ##STR1## wherein A is hydrogen or methyl; A' is hydrogen, methyl, phenyl or halogen; n is 1 or 1.5 and when n is 1, B is hydrogen or methyl and when n is 1.5, B is hydrogen; Y is oxygen or sulfur; R and R' are hydrogen, methyl, chloromethyl or bromomethyl.Type: GrantFiled: November 13, 1978Date of Patent: October 14, 1980Assignee: The Dow Chemical CompanyInventors: George J. Atchison, Gerald K. McEwen, Violete L. Stevens
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Patent number: 4124389Abstract: A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.Type: GrantFiled: April 7, 1977Date of Patent: November 7, 1978Assignee: The Dow Chemical CompanyInventors: Clayton W. Hoornstra, Violete L. Stevens
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Patent number: 4092339Abstract: Homopolymers and copolymers of glycidyl esters are made by reacting the acids to be esterified with the corresponding polymer of tert.-alkyl glycidyl ether under substantially anhydrous conditions and in the presence of a strong acid catalyst, preferably a sulfonic acid. The reaction proceeds satisfactorily at about 100.degree.14 150.degree. C with displacement of the tert.-alkyl group by the acyl group of the acid and evolution of tert.-olefin. By use of the appropriate proportion of reactant acid and/or appropriate reaction time, any desired proportion of the glycidyl groups can be esterified.Type: GrantFiled: November 19, 1975Date of Patent: May 30, 1978Assignee: The Dow Chemical CompanyInventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
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Patent number: 4086151Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.Type: GrantFiled: June 30, 1977Date of Patent: April 25, 1978Assignee: The Dow Chemical CompanyInventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
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Patent number: 4080161Abstract: Antistatic compositions for topical application to substrates, which comprise(a) a polymer of less than about 20,000 molecular weight consisting essentially of, in polymerized form, about 10 to 99 mole % alkylene oxide, of 2 to 4 carbon atoms, about 1 to 90 mole % glycidol and about 0 to 15 mole % of the glycidyl ester of a fatty acid of about 2 to 20 carbon atoms and about 0 to 15 mole % of the glycidyl monoester of a polycarboxylic acid,(b) a curing agent capable of cross-linking the polymer by reaction with the primary hydroxyl groups of the glycidol units, such as melamine-formaldehyde condensates, dialdehydes, polycarboxylic acids and their anhydrides, epoxy resins (polyepoxides), polyisocyanates, and the like and(c) a catalyst for the curing reaction, such as zinc fluoroborate, a sulfonic acid, phosphoric acid, ammonium sulfate or the like.Type: GrantFiled: April 20, 1976Date of Patent: March 21, 1978Assignee: The Dow Chemical CompanyInventors: Violete L. Stevens, Arthur R. Sexton, James W. Lalk, Ronald D. Deibel, Fred P. Corson
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Patent number: 4077991Abstract: New polymers are copolymers of glycidol, glycidyl esters of fatty acids, and, optionally, alkylene oxides. They are conveniently made by the reaction of a fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. They are useful as coatings, lubricants, plasticizers, textile antistatic agents and surfactants.Type: GrantFiled: November 19, 1975Date of Patent: March 7, 1978Assignee: The Dow Chemical CompanyInventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
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Patent number: 4072529Abstract: A negative-working, reversibly gelled composition is disclosed, suitable for use as the photocurable component in a blank for preparation of an article in relief, such as a printing plate. Uncured portions of the composition are removed with an aqueous solution following imagewise modulated exposure of such a blank to actinic radiation. The composition comprises a first organic polymer bearing per molecule, at least one ethylenically unsaturated group which is polymerizable by a free radical source; and a second organic polymer bearing per molecule, at least two Z groups, Z being a primary hydroxyl or a mercapto group, with the proviso that when said first organic polymer bears at least two Z groups per molecule, said second organic polymer may be omitted; said Z groups being reacted by contact with a dialdehyde to produce the reversibly gelled composition.Type: GrantFiled: August 20, 1975Date of Patent: February 7, 1978Assignee: The Dow Chemical CompanyInventors: Clayton W. Hoornstra, Violete L. Stevens
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Patent number: 4014854Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.Type: GrantFiled: February 20, 1974Date of Patent: March 29, 1977Assignee: The Dow Chemical CompanyInventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson
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Patent number: 4006068Abstract: Polymercaptocarboxylic esters of polyglycidols comprising units represented by the formula ##STR1## are disclosed as well as a method for utilizing the same to prepare cross-linked polymeric compositions.Type: GrantFiled: April 30, 1975Date of Patent: February 1, 1977Assignee: The Dow Chemical CompanyInventor: Violete L. Stevens
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Patent number: 4003961Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.Type: GrantFiled: December 22, 1975Date of Patent: January 18, 1977Assignee: The Dow Chemical CompanyInventors: Violete L. Stevens, Arthur R. Sexton, Frederick P. Corson